Location of blower motor switch resistor on 2004 Grand Marquis

Here's a video Joe on your blower motor resistor. How to Replace Blower Motor Resistor Ford Crown Vic

Power goes from the fuse to the function select switch, then to the blower motor. The fan switch and the resistor is the ground circuit for the blower.

its locate under the hood at the front of the car on the driver side.

• For this a 2004 Grand Marquis the blower motor resistor is located on the bottom of the heater/AC housing on the passenger side of the car under the instrument panel. You need to remove the glovebox off from the instrument panel to replace it.

• To change it follow these steps.

1. Remove the neg battery cable from the battery.
2. Wait 5 minutes before moving on. This is important to wait or you risk the air bags accidentally deploying.
3. Remove the glovebox from the instrument panel.
4. Pull out the lock on the blower motor resistor wire harness connector to unlock the connector latch.
5. Depress the latch on the connector and unplug the connector from the resistor.
6. Now remove the two screws holding the resistor in place.
7. Now remove the resistor.
8. Revers steps to install new on.
9. hope this helps.

Regards, Tony

Check the fuse first. If the fuse is good then either the blower motor or the blower motor resistor pack is defective. Check the blower motor by applying 12 volts directly to the motor. If it runs it is good and most likely the resistor pack is bad and needs replacing. it can also be the blower motor speed control but rarely do they go bad.

this problem is not caused by the switch, it is caused by a defective blower motor speed control resistor, the resistor is located near the blower motor.

check for fuses. If some other defective stuff that you replaced broke the fuse then you may need to repower the system by replacing the fuse or a relay.

As for the air, do you mean no blower for both heat function and A/C function? An Owners Manual would show location for fuse and relay for blower. A web-search with term like "2004 Mercury Grand Marquis fuse panel or
blower relay location" could help.

Last, do not know if blower resistor relay was known good quality. This part is tempermental. Sometimes takes tap from broom or snowbrush handle to wake it up. Sad part is that after warranty there is little benefit from a used to new part. Should have been a National recall on this part.

there is a resistor for the fan motor which works the lower speeds, you need to replace that, it is normally located near the blower motor, got 3-6 wires plugged in it

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heres the electrical diag.....